Recently my laptop MorphOS hardware died and I went down to the basement to wake up an old Powermac G5.
When trying the Moroph OS CD I got the "graphics card not supported message and it looks like I have a card from Nvidia think it looks like AGP connection.

The Powermac has serial CK438HGWQPR Then some ethernet and bluetooth info on the label.

I did find the hardware list over suitable GPU's but I am still unsure about some things before "shopping for anew card"

It has to be an AGP card so far I understand But I get a bit confused when I read that it can be cards for a windows system and not only mac cards ? If it is a Windows card Iguess it has to be "flashed" to work in an mac ?

So if anyone can giude me to a card that "works" and what to look for, I be very happy.

If it really is an AGP G5 you want to hunt down a genuine Apple card. Most common are variants of the Radeon9600 with 64–256MB. 9800 and cards in the lower X____ range also exist.
Flashing PC cards of the same range is a hit and miss.

Newer AtomBIOS cards can work but without a fallback card that has both an Apple OF ROM and is supported by MorphOS you can only boot blind blocking all sensible option for installing or updating MorphOS.

Depending on where you live it might make more sense to hunt down a basic PCIe G5, keep the NVidia that it will most likely come with installed an add a PC Radeon. X1600-1950 or one of the listed HD____.

I wrote you a PM.

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From what I remember, there's no "blind boot" option in AGP based G5s. If there's already MorphOS installed on the hard drive - it will boot. But there's no option to make it boot either from a LiveCD or USB drive if there's no Apple ROM equipped gfx card in AGP slot.

The PCIe based G5 is much better in that regard, as you can "blind boot" MorphOS from a LiveCD even if gfx card cannot display Open Firmware at all.

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Yes, that is a "blind boot". No install, no update.

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Haven't tried but doesn't that still require an Apple card to be present?

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I believe the computer will "blind boot" just fine from a LiveCD if a C key is pressed during startup even if there's just a single, "OF unsupported" gfx card in PCIe slot.